I guess the image above shows what focus is all about.
If you are focused, you can go far. Your energy basically will be used in one direction. So you can go far. If not, you might go in so many direction and you will lose focus.
Those energy that you have will be diluted and in the end, you won’t be able to reap the benefit quickly enough just because you go into too many directions.
Consider Elon Musk.
He do it one by one. From one company to another company. From a weak standing to a strong one. He gathered small wins and In the end, he is able to make big wins. And big bets too.
But he only did it after he has all of those small (well, it is big, actually) wins.
X.com, PayPal, and all those success keeps piling up enabling him to eventually diversify himself into many businesses.